// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
#pragma once

#include <pollux/vector/complex_vector.h>
#include <pollux/vector/decoded_vector.h>

namespace kumo::pollux::exec {
    class AggregationMasks {
    public:
        /// @param maskChannel Index of the 'mask' column for each aggregation.
        /// Aggregations without masks use std::nullopt.
        explicit AggregationMasks(
            std::vector<std::optional<column_index_t> > maskChannels);

        /// Process the input batch and prepare selectivity vectors for each mask by
        /// removing masked rows.
        void addInput(const RowVectorPtr &input, const SelectivityVector &rows);

        // Return prepared selectivity vector for a given aggregation. Must be called
        // after calling addInput().
        const SelectivityVector * MELON_NULLABLE
        activeRows(int32_t aggregationIndex) const;

    private:
        std::vector<std::optional<column_index_t> > maskChannels_;
        melon::F14FastMap<column_index_t, SelectivityVector> maskedRows_;
        DecodedVector decodedMask_;
    };
} // namespace kumo::pollux::exec
